I highly suggest NOT using a mobile framework on desktop applications. It's not architected for it. Also using mobile metaphors for desktop use is going to be somewhat of a UX nightmare. I've seen it time and time again and the projects fail because of it.

Mobile and desktop app strategy

Mobile and desktop app strategy

I have been reading the Sencha forums about this topic (mob vs. desktop frameworks being different products altogether).

I've already built my Sencha Touch 2 apps. For a first time user of the framework, I think I did "okay". Lost some hair and a few weeks of sleep, but I can manage
I've been very careful with the UX -- made sure to make it usable on iPad but manageable on desktop/mouse. (this was because I had to -- time/money constraints like every other company on the planet)

If I now want to allow desktop users to access these apps, what is the best technology strategy?
Back-port to ExtJS 4?
Or is there a Sencha CMD switch to do the magic for me? (not talking about magically modifying UX... just talking about backend engine/api/CSS/HTML support nightmare being taken care of by the framework)

Any sage advice from the developer community would be greatly appreciated.
I really am loathing opening up all the MVC code and ripping it to shreds just so a desktop browser can render what's already done!